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I bought an electric heater from Grainger (18000) BTU, only catch was, (and I was avoiding)I had to install a 240v/30 outlet plus a 30 amp breaker. Now the garage stays at about 55 degrees while I'm not working out there and I can turn the thermostat up and get it to stay at 65 degrees while working. It only took 30 minutes to move from 45 to 60 degrees. Just wanted to follow-up to anyone who is still having problems.


I need to do something like this. My garage is 24x40 and insulted so I'm wondering what size I would need to heat it kind of like yours. 18000 BTU's enough? Thanks.

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Actually, all three electric heaters I purchased were rated in BTU'S not kwatts. Its good to compare BTUS's when comparing propane with electric. The It dosent matter what it stands for as long as you know that 18000 BTU's is rated to heat a 500 square foot space. I leaned this the hard way by going cheap at first with the 5000 BTU heaters. It wasnt until I purchased the 18000 BTU propane heater that I realized the difference in heating potential. My garage is only a 20 x 20 = 400 square feet but I oversized the heater slightly so it wouldn't run as often. Like I said I went to three different stores, and returned three heaters until I got the right match. this heater is only 16" by 12" by 12". My garage is insulated as well. However your garage is 960 square feet. Its easy to figure out what heater size you need just go to the grainger web site and read the descriptions. They will tell how many BTU's the heaters are and what size garage they will heat. You might want to get two smaller units and heat from opposite directions.

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1) No need to keep going back and forth trying to figure out what size heater you need. Again;

http://www.ultimategarageheater.com/garage-heater-calculator.php

you will note that your 400sq ft. garage (insulated) needs about 4.4kw (approximately 15,000 BTUH) for a 60 deg F temperature change.

2) All commercial electric heaters are rated in KW, but no matter as long as you realize that 3414 BTUH = 1kw it's simple math to go back and forth.

3) ratings per square foot are pretty rudimentary (even more so than the simple calculator I linked above) and doesn't take into account ceiling height, insulation, # and type of doors and windows, exposure, etc, etc.


Just my as I do this for a living.

Dave

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My dad insulated his single car garage and didn't have much money left over to spend on a heater so he bought a 230v 18,000BTU portable contstruction heater. These past few days have been about the coldest it ever gets here and that heater gets the garage up to 50-55F so it's not bad at all, not super hot but very workable in a sweater and an extra pair of pants. He said some guru calculated the cost of that thing to be about 23 cents an hour. And you're only heating it while you're working in there so I don't think he'd ever spend more than 15 bucks a month heating that garage.

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to figure size of heater needed..multiply square footage by ceilg height..(cubic feet now) and then multiply that by 5.5 to 6.0 for the BTU size heater needed..example.600 sq foot room with 8 foot ceiling would be 4800 cubic feet by 5.5 is 26,400 so at the low end or minimal size heater a 27000 btu heater would heat it..4800 times 6 is 28,800 so a 28,800 btu heater at the max ( for efficiency) would work very well. too small will not heat a room well enough...too big will use more fuel than needed to do the job so try to stay close

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Dave